![]() ![]() I'm not sure you can solve it with aįor example, if you have a TextBox in your Programmatically is always a hard thing because you have to think about all the Than one child control, this provides an odd user experience. Your scenario, you would have to decide if you really want the TVI, itself, toīe so strongly associated with a single control in the TVI. Mouse click handler, but that won't get called in this scenario because TVI hasĪ class handler that marks the bubbled mousedown event as handled.) State and to support toggling via the mouse. The CheckBox just becomes a way to visualize the checked Yes, this approach is really a way to turn the TVI, itself, Any solution will likely require that because you'll never want theĪdditional navigation stop for the CheckBox.Ĭode if you'd like. You will still need to set Focusable to false on theĬheckBox. (Although, it doesn't include the ButtonBase events or properties. Supports the IsThreeState property and raises all the expected toggle buttonĮvents (Checked, Unchecked, and Indeterminate) on the target element. Press or mouse click will update the attached IsChecked property. Presses) and responds to those events just like a toggle button. ![]() The class monitors the TreeViewItem for input events (mouse clicks or key IsVirtualToggleButton property is attached to the TreeViewItem and set to true, ![]() Order to add support for yada yada yada.) Wordy description about leveraging an attached property to extend a class in Guess the en vogue term for this type of thing is "attachedīehavior". This doesn't work either, because focus never leaves the first CheckBox.Īnyone ever figured this out before? If so, what's the trick? This seems like it should be a simple XAML-only solution, but I can't figure it out! :( I also tried writing some code that handles GotFocus and GotKeyboardFocus of all TreeViewItems and then use FindName to get at the CheckBox and give it focus. I tried setting Focusable on the ItemContainerStyle to false, but then the keyboard navigation does not work properly. I find that the TreeViewItems want to take focus first, requiring me to press an arrow key twice to bring focus to the contained CheckBox. I want it so that the user can easily navigate through the tree and press Spacebar to check/uncheck an item's CheckBox. Suppose I have a TreeView where items should all contain CheckBoxs. I just can't find a way to do this, even after trying several hacks. All rights reserved.I have a WPF programming question for you all. © 2009-2023 Rocky Mountain Computer Consulting, Inc. At that point there is no more recursion and control unwinds back up the call stack.ĭownload the example to experiment with it and to see additional details. The event handler calls itself recursively until the event handler reaches a node with no children. When the program changes a child node's Checked state, that node raises an AfterCheck event so the event handler executes for that node, too, and it sets the Checked property for the child's children. It then loops over the node's child nodes and sets all of their Checked properties to match. This code gets the node that was checked or unchecked and saves its Checked state in the variable is_checked to make the code easier to read. ![]() Private void trvMeals_AfterCheck(object sender, TreeViewEventArgs e) Check or uncheck all nodes in this node's subtree. This doesn't match the way the checkboxes work but it's the behavior of the control so I'm not going to try to fight it.) (This event fires whenever a checkbox's value changes, except it only fires once if you double-click a node. When the user checks or unchecks a node, the following AfterCheck event handler executes. Deselecting Dessert also deselected all of the items in its TreeView subtree. I then deselected the Wine and Dessert items. Then the user can deselect individual nodes within the subtree if desired.įor example, in the picture shown here I checked the Dinner box and the program checked all of the items in the Dinner TreeView subtree. Sometimes it's useful to let the user select a TreeView subtree by clicking on a higher-level node. C# Helper: Check a TreeView subtree in C# ![]()
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